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Re: Increased memory usage with scsi-mq

From Christoph Hellwig <hch@lst.de>
Newsgroups linux.kernel
Subject Re: Increased memory usage with scsi-mq
Date 2017-08-05 10:50 +0200
Message-ID <ub2Wt-2Co-1@gated-at.bofh.it> (permalink)
References <uaS14-3Oj-21@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Fri, Aug 04, 2017 at 10:00:47PM +0100, Richard W.M. Jones wrote:
> I read your slides about scsi-mq and it seems like a significant
> benefit to large machines, but could the out of the box defaults be
> made more friendly for small memory machines?

The default inumber of queues and queue depth and thus memory usage is
set by the LLDD.

Try to reduce the can_queue value in virtio_scsi and/or make sure
you use the single queue variant in your VM (which should be tunable
in qemu).

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Thread

Increased memory usage with scsi-mq "Richard W.M. Jones" <rjones@redhat.com> - 2017-08-04 23:10 +0200
  Re: Increased memory usage with scsi-mq Christoph Hellwig <hch@lst.de> - 2017-08-05 10:50 +0200
    Re: Increased memory usage with scsi-mq "Richard W.M. Jones" <rjones@redhat.com> - 2017-08-05 11:30 +0200
      Re: Increased memory usage with scsi-mq Christoph Hellwig <hch@lst.de> - 2017-08-05 15:50 +0200
        Re: Increased memory usage with scsi-mq "Richard W.M. Jones" <rjones@redhat.com> - 2017-08-05 18:00 +0200
          Re: Increased memory usage with scsi-mq Paolo Bonzini <pbonzini@redhat.com> - 2017-08-07 14:20 +0200
            Re: Increased memory usage with scsi-mq "Richard W.M. Jones" <rjones@redhat.com> - 2017-08-07 14:30 +0200
              Re: Increased memory usage with scsi-mq Paolo Bonzini <pbonzini@redhat.com> - 2017-08-07 15:10 +0200
                Re: Increased memory usage with scsi-mq Christoph Hellwig <hch@lst.de> - 2017-08-09 18:10 +0200
                Re: Increased memory usage with scsi-mq Paolo Bonzini <pbonzini@redhat.com> - 2017-08-09 19:00 +0200
                Re: Increased memory usage with scsi-mq "Richard W.M. Jones" <rjones@redhat.com> - 2017-08-10 14:30 +0200
                Re: Increased memory usage with scsi-mq Paolo Bonzini <pbonzini@redhat.com> - 2017-08-10 15:00 +0200
                Re: Increased memory usage with scsi-mq "Richard W.M. Jones" <rjones@redhat.com> - 2017-08-10 16:20 +0200
                Re: Increased memory usage with scsi-mq Paolo Bonzini <pbonzini@redhat.com> - 2017-08-10 16:40 +0200
                Re: Increased memory usage with scsi-mq "Richard W.M. Jones" <rjones@redhat.com> - 2017-08-10 17:50 +0200
                Re: Increased memory usage with scsi-mq Paolo Bonzini <pbonzini@redhat.com> - 2017-08-10 18:10 +0200

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